President Obama’s recent announcement is a clear sign that tougher fuel efficiency standards will come sooner rather than later.

Mark Gillies is the executive editor of Car and Driver Magazine. He says, if stricter standards are passed, automakers will have to make big changes to their entire fleets of cars and trucks.

“It’s like a super tanker. Trying to turn the super tanker around is not easy. Trying to get cars to the point where they’re 25% more fuel efficient in 6 years is not the work of the moment. You’re going to see some car makers manage to do it and some car makers won’t be able to do it.”

Gillies says if these new standards pass, you’ll see automakers scrambling to make more electric and hybrid cars. He says it could also curb development of sportier cars.

That’s because car companies might have to spend their resources developing the greener cars of the future.